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MERC ER01-12
9
Particulate Organic Carbon
(POC) content of challenge water during uptake. Ambient describes
natural conditions of water in the Port of Baltimore. Control and treated show levels in test
waters from time-integrated samples collected through the entire uptake, after the mixture of
Arizona Test Dust, micronized humate and instant
ice tea was added to water prior to the split in
control and treated lines.
Mean (mg/l)
SD
Ambient
10.2
0.10
Control
15.7
0.35
Treated
14.6
0.32
UV Transmittance
(UVT) percentages for challenge water during uptake. Ambient describes
natural conditions of water in the Port of Baltimore and T0, T1, and T2 for challenge water are
%UVT values from three sample time points (beginning, middle, and end of uptake) after the
mixture of Arizona Test Dust, micronized humate and instant
ice tea was added. The values for
T1 between filter and UV and T1 control were collected at the midpoint of the uptake process to
provide insight to influence of the filter on UVT.
Mean %UVT
SD
Ambient
83.8
0.06
T0 challenge water
70.6
0.10
T1 challenge water
71.7
0.00
T2 challenge water
76.4
0.25
T1 between filter and UV
71.3
0.51
T1 control
74.9
0.25
Active Chlorophyll –
Control and treated show chlorophyll levels in test waters from time-
integrated samples collected through the entire uptake and discharge.
Live Organisms >50 µm
–
Significant numbers of organisms in the control water on discharge
were dead, most likely due to a significant drop in dissolved oxygen level (see values above).
The organism in the size category included: Calanoida, cyclopoida, harpactiocoida, copepod
nauplii, polychaeta, barnacle nauplii, medusa, rotifer, eggs, and large diatoms.
Uptake
Mean µg/l
Uptake
SD
Discharge
Mean µg/l
Discharge
SD
Control
231.6
1.51
81.0
5.52
Treated
232.9
3.14
61.2
3.35
Uptake
Mean/m
3
Uptake
SD
Discharge
Mean/m
3
Discharge
SD
Control
136,022
2,713
5,459
793
Treated
88,432
6,571
8,314
952